The Human Body: An Orientation

Overview of Anatomy and Physiology

Anatomy and physiology are foundational sciences in understanding the human body. Anatomy focuses on the structure of body parts, while physiology explores their functions and interactions.

• Anatomy: The study of the structure of body parts and their relationships to one another.

• Physiology: The study of the function of the body’s structural machinery.

Subdivisions of Anatomy

Anatomy is divided into several branches, each focusing on different aspects of body structure.

• Gross (Macroscopic) Anatomy: Study of large, visible structures. Includes:

  • Regional Anatomy: Examines all structures in a particular area of the body.

  • Systemic Anatomy: Studies body systems, such as the cardiovascular or skeletal systems.

  • Surface Anatomy: Focuses on external features and their relation to deeper structures.

• Microscopic Anatomy: Study of structures too small to be seen with the naked eye.

  • Cytology: Study of cells.

  • Histology: Study of tissues.

• Developmental Anatomy: Study of structural changes throughout the lifespan.

  • Embryology: Study of developmental changes before birth.

Subdivisions of Physiology

Physiology is often organized by organ systems and focuses on how body parts work and interact at cellular and molecular levels.

• Renal Physiology: Study of kidney function.

• Cardiovascular Physiology: Study of heart and blood vessels.

• Cellular and Molecular Physiology: Examines processes at the cellular and molecular level, such as membrane transport and signal transduction.

Key Terms and Concepts

• Structure: Refers to the physical makeup and arrangement of body parts.

• Function: Refers to the physiological processes carried out by body structures.

• Organ System: A group of organs that work together to perform a specific function.

Example: Relationship Between Anatomy and Physiology

• The structure of the heart (anatomy) enables it to pump blood (physiology) throughout the body.

• The arrangement of bones and muscles (anatomy) allows for movement (physiology).

Comparison Table: Anatomy vs. Physiology

Summary

• Anatomy and physiology are closely related disciplines essential for understanding the human body.

• Anatomy describes what body parts are, while physiology explains how they work.